shadow_method_assignment_wat.rb

require 'ostruct'

def thing
  OpenStruct.new(foo: 'FOO')
end

context 'foo' do
  it 'returns foo' do
    expect(thing.foo).to eq('FOO')
  end

  context 'shadowing the method with a local variable and using the method in the assignment' do
    specify 'throws an error if you call the method without parens in the assignment' do
      expect { thing = thing.foo }.to raise_error(NoMethodError)
      #    Failure/Error: thing = thing.foo
      #    NoMethodError:
      #      undefined method `foo' for nil:NilClass
    end

    specify 'works if you use parens to call the method in the assignment' do
      expect { thing = thing().foo }.not_to raise_error
    end
  end
end